The medical container 1 includes a container main body portion 20 and a port portion 3. The port portion 3 includes a sealing member including a cap 5 and an elastic seal member 6 and a tubular opening 21 made of a thermoplastic resin. The cap 5 includes a cylindrical main body 51, a protruding portion 52 protruding outward from the lower end side portion of the cylindrical main body portion, a first fusion rib 55 protruding downward from the lower surface of the protruding portion, and a cylindrical shape. A second fusing rib 56 protruding downward from the lower surface of the main body 51. The first fusion rib 55 and the second fusion rib 56 are melted, and the cap is fixed to the flange portion.医療用容器１は、容器本体部２０とポート部３を備える。ポート部３は、キャップ５と弾性シール部材６を備える封止部材と、熱可塑性樹脂製の管状開口部２１とからなる。キャップ５は、筒状本体部５１と、筒状本体部の下端側部より外方に突出する突出部５２と、突出部の下面より下方に突出する第１の融着用リブ５５と、筒状本体部５１の下面より下方に突出する第２の融着用リブ５６とを備える。第１の融着用リブ５５および第２の融着用リブ５６が溶融し、キャップはフランジ部に固着している。
